So, who were they? A 13-year-old who used a mix of guesswork and preferences, a 47-year-old English woman who used algorithms and data science (despite not knowing the game), and a 70-year-old bookie who had his finger on the pulse of the betting world.

Proof that different factors can lead us to believe we have control over something with odds at 1 in 9,223,372,036,854,775,808. For those who don't wanna do the math that's 9.2 quintillion.

That's not to say that different factors don't provide an edge. Knowing the history of the teams, their ranks, how they performed historically in the playoffs, all provide important information, to humans and machines that try to make the perfect bracket.

The way people fill out their brackets often mimics the way investors pick trades or allocate assets. Some use gut feel, some base their decisions on rank and past performance, and some use predictive models.